The costs of Tension Leg Platform systems can be justified for use in the deep water reservoirs which are currently attracting attention because, at the water depths being considered, TLP's are less expensive than alternative structures. The results of a comparative study done by Daily, Karsan and Kypke compares the qualitative cost between conventional fixed structures, Guyed Towers and Tension Leg Platforms. The cost comparison crossover points for the offshore structure alternatives depend on environmental factors as well as water depth. The severity of the sea environment, seabed conditions and topography, possible seismic activity, projected life of the field and desireability of platform reuse are all cost factors. In general, the cost crossover points move to the left, i.e. to shallower water depths, with an increase in degree of any of the environmental variables other than water depth. The design features for the TLP are common to all offshore structures. The particular platform configuration will depend on the design approach, or the analytical considerations and techniques selected. The design system presented here utilizes methods which consider slow varying drift force and high oscillatory first-order wave forces so that the impact of the large structural components of the TLP are incorporated in the analyses of its motion and stationkeeping capability. Final selection of structural geometry utilizes an optimization procedure which includes an economical evaluation of the design process.

Media Info

  • Features: References;
  • Pagination: p. 287-296

Subject/Index Terms

Filing Info

  • Accession Number: 00329927
  • Record Type: Publication
  • Report/Paper Numbers: Volume 4 Proceeding
  • Files: TRIS
  • Created Date: Apr 15 1981 12:00AM